【科学60秒】月球=水球？_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】月球=水球？

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When astronaut Alan Shepard took his first swing at a golf ball on the moon, he hit more dirt than ball. The dust he ___1___ reinforced the idea that the moon is one big ___2___. But looks can be deceiving. Now, scientists reanalyzing lunar samples say that our satellite is at least a hundred times wetter than we thought. The results appear in the Proceedings of the National Academy of Sciences.
Astronauts ___3___ the Apollo missions brought home plenty of moon rocks. And in 40 years of looking at those samples, no one ever found a trace of water. That could be because the collision that made the moon in the first place was so hot that volatile elements like hydrogen, a key component of H2O, largely burned away.
Now, using a technique that can identify elements present in just a few parts-per-billion, scientists have taken another look at three lunar samples, two from Apollo missions and one ___4___ found in Africa. And they detected hydroxyl, the HO that’s left behind when a rock crystallizes from ___5___ containing water.
The results suggest that water may be ubiquitous in the interior of the moon. Although there’s probably not enough to qualify as a water hazard.